[POWERPC] PS3: Checkpatch cleanups for drivers/ps3/ps3-vuart.c

Cleanup coding errors in drivers/ps3/ps3-vuart.c as reported by
checkpatch.

Signed-off-by: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>
Signed-off-by: Geoff Levand <geoffrey.levand@am.sony.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>